Air purifier



FIG. 1 is a perspective view of an air purifier showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a perspective view thereof; wherein the air purifier is in anoperating condition.

The broken lines depict portions of the air purifier that form no partof claimed design.

The ornamental design for an air purifier, as shown and described. 